diff --git a/src/calibre/devices/winusb.py b/src/calibre/devices/winusb.py
index 56cb59ba54..1c0468f61b 100644
--- a/src/calibre/devices/winusb.py
+++ b/src/calibre/devices/winusb.py
@@ -396,7 +396,6 @@ CM_Get_Child = cwrap('CM_Get_Child', CONFIGRET, POINTER(DEVINST), DEVINST, ULONG
 CM_Get_Sibling = cwrap('CM_Get_Sibling', CONFIGRET, POINTER(DEVINST), DEVINST, ULONG, errcheck=config_err_check)
 CM_Get_Device_ID_Size = cwrap('CM_Get_Device_ID_Size', CONFIGRET, POINTER(ULONG), DEVINST, ULONG)
 CM_Get_Device_ID = cwrap('CM_Get_Device_IDW', CONFIGRET, DEVINST, LPWSTR, ULONG, ULONG)
-CM_Request_Device_Eject = cwrap('CM_Request_Device_EjectW', CONFIGRET, DEVINST, c_void_p, LPWSTR, ULONG, ULONG, errcheck=config_err_check)
 
 # }}}